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Holdawayite

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Holdawayite

Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
Holdawayite, etc.

Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
Holdawayite

Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
Holdawayite, etc.

Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
Holdawayite

Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
Holdawayite, etc.

Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
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About HoldawayiteHide

Formula:
Mn6(CO3)2(OH)7(Cl,OH)
Hardness:
3
Crystal System:
Monoclinic
Name:
For US petrologist, Michael Jon Holdaway (b. 1936).
This page provides mineralogical data about Holdawayite.


Classification of HoldawayiteHide

IMA status:
Approved
Approval Year:
1986
Strunz 8th ed.:
5/C.06-20
Nickel-Strunz 10th (pending) ed.:
5.BA.20

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
Dana 8th ed.:
16b.4.2.2

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:1
Hey's CIM Ref.:
11.12.2

11 : Carbonates
12 : Carbonates of Mn

Physical Properties of HoldawayiteHide

Hardness:
3 on Mohs scale

Optical Data of HoldawayiteHide

Type:
Biaxial (-)
RI values:
nα = 1.644 nβ = 1.719 nγ = 1.721
2V:
Measured: 12° to 18°, Calculated: 16°
Max Birefringence:
δ = 0.077
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong

Chemical Properties of HoldawayiteHide

Formula:
Mn6(CO3)2(OH)7(Cl,OH)
IMA Formula:
Mn2+6(CO3)2(OH)7(Cl,OH)
Elements listed:
C, Cl, H, Mn, O - search for minerals with similar chemistry

Crystallography of HoldawayiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 23.437(5) Å, b = 3.3137(3) Å, c = 16.618(6) Å
β = 111.15(2)°
Ratio:
a:b:c = 7.073 : 1 : 5.015
Unit Cell V:
1,203.67 ų (Calculated from Unit Cell)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.93 (100)
7.77 (40)
5.459 (80)
3.879 (70)
2.926 (40)
2.690 (60b)
2.589 (50b)

Type Occurrence of HoldawayiteHide

Synonyms of HoldawayiteHide

Other Language Names for HoldawayiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Allactite4 photos of Holdawayite associated with Allactite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.BA.05AzuriteCu3(CO3)2(OH)2Mon. 2/m : P21/b
5.BA.10GeorgeiteCu2(CO3)(OH)2 · 6H2OAmor.
5.BA.10Glaukosphaerite(Cu,Ni)2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.10Kolwezite(Cu,Co)2(CO3)(OH)2Tric.
5.BA.10MalachiteCu2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.10Mcguinnessite(Mg,Cu)2(CO3)(OH)2
5.BA.10NullaginiteNi2(CO3)(OH)2Mon.
5.BA.10PokrovskiteMg2(CO3)(OH)2Mon.
5.BA.10Rosasite(Cu,Zn)2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.10Zincrosasite(Zn,Cu)2(CO3)(OH)2Mon.
5.BA.10ChukanoviteFe2+2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.15Aurichalcite(Zn,Cu)5(CO3)2(OH)6Mon. 2/m : P21/m
5.BA.15HydrozinciteZn5(CO3)2(OH)6Mon. 2/m : B2/m
5.BA.25DeferniteCa6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5)Orth. mmm (2/m 2/m 2/m) : Pnma
5.BA.25UM1977-03-COSiO:CaClHCa10-11(CO3)7(SiO4)Cl1-2(OH)1-2Mon.
5.BA.30Loseyite(Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10Mon. 2/m
5.BA.30Sclarite(Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10Mon. 2/m : B2/b

Related Minerals - Dana Grouping (8th Ed.)Hide

16b.4.2.1DeferniteCa6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5)Orth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.12.1RhodochrositeMnCO3Trig. 3m (3 2/m) : R3c
11.12.3DesautelsiteMg6Mn3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m)
11.12.4KutnohoriteCaMn2+(CO3)2Trig. 3 : R3

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for HoldawayiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 37: 637-642.
American Mineralogist: 73: 632-643.

Internet Links for HoldawayiteHide

Localities for HoldawayiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany
 
  • Rhineland-Palatinate
    • Rhein-Lahn-Kreis
Wittern: "Mineralfundorte in Deutschland", 2001
        • Frücht
Der Aufschluss Vol.55, March/April 2004
Namibia (TL)
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
American Mineralogist (1988): 73: 632-642.
Romania
 
  • Maramureș
http://minerals-of-the-carpathians.eu; Udubasa, G., Hartopanu, P., Ilinca, G. (1996). The Regionally metamorphosed Fe-Mn Ore Deposit at Razoare, Preluca Mts., Romania. Romanian Journal of Mineralogy, 77, 3-20.
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